AdminLTE/scss/dark/bootstrap/forms/_form-control.scss

//
// General form controls (plus a few specific high-level interventions)
//

.form-control {
  color: $input-color-alt;
  background-color: $input-bg-alt;
  border: $input-border-width solid $input-border-color-alt;

  @include box-shadow($input-box-shadow-alt);

  // Customize the `:focus` state to imitate native WebKit styles.
  &:focus {
    color: $input-focus-color-alt;
    background-color: $input-focus-bg-alt;
    border-color: $input-focus-border-color-alt;
    @if $enable-shadows {
      @include box-shadow($input-box-shadow-alt, $input-focus-box-shadow-alt);
    } @else {
      box-shadow: $input-focus-box-shadow-alt;
    }
  }

  // Placeholder
  &::placeholder {
    color: $input-placeholder-color-alt;
  }

  // Disabled and read-only inputs
  &:disabled,
  &:read-only {
    background-color: $input-disabled-bg-alt;
    border-color: $input-disabled-border-color-alt;
  }

  // File input buttons theming
  &::file-selector-button {
    color: $form-file-button-color-alt;
    @include gradient-bg($form-file-button-bg-alt);
    border-color: inherit;
  }

  &:hover:not(:disabled):not(:read-only)::file-selector-button {
    background-color: $form-file-button-hover-bg-alt;
  }

  &::-webkit-file-upload-button {
    color: $form-file-button-color-alt;
    @include gradient-bg($form-file-button-bg-alt);
    border-color: inherit;
  }

  &:hover:not(:disabled):not(:read-only)::-webkit-file-upload-button {
    background-color: $form-file-button-hover-bg-alt;
  }
}

// Readonly controls as plain text

.form-control-plaintext {
  color: $input-plaintext-color-alt;
  background-color: transparent;
  border: solid transparent;
}